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JOURNALS // Uspekhi Matematicheskikh Nauk // Archive

1991, Volume 46, Issue 5(281)


Integrable maps
A. P. Veselov
3
Degeneracies of differential 1-forms and Pfaffian structures
M. Ya. Zhitomirskii
47
Flattenings of projective curves, singularities of Schubert stratifications of Grassmannians and flag varieties, and bifurcations of Weierstrass points of algebraic curves
M. E. Kazarian
79
Solved problems in the Kourovka Notebook
V. D. Mazurov
121

In the Moscow Mathematical Society
Communications of the Moscow Mathematical Society
Properties of homomorphisms of Riesz groups
E. E. Shirshova
157
The spectral asymptotics of pseudodifferential systems elliptic in the sense of Douglis and Nirenberg
K. Kh. Boimatov
159
Fubini-Veneziano fields in quantum projective field theory
S. A. Bychkov, D. V. Yur'ev
161
On Galois groups of functional fields over fields of finite type over $\mathbb Q$
V. A. Voevodskii
163
Periodic billiard trajectories in polygons
Ya. B. Vorobets, G. A. Gal'perin, A. M. Stepin
165
On the algebraic independence of the values of some subclasses of hypergeometric $E$-functions
V. A. Kulagin
167
Mappings that raise the fundamental dimension Fd
Yu. V. Lubenets
169
Finite-zone solutions of Davey–Stewartson 2 equations
T. M. Malanyuk
171
On the existence of a self-adjoint Schrödinger operator on a spherically symmetric manifold
I. M. Oleinik
173
On the unboundedness of solutions of a system of partial differential equations
O. S. Rozanova
175
Joinings of dynamical systems. Approximations and mixing
V. V. Ryzhikov
177
Ergodicity of a Hamiltonian system of two particles in an exterior field
N. I. Chernov
179

Mathematical Events in the USSR and abroad
Lev Isaakovich Ronkin (on his sixtieth birthday)
L. A. Aizenberg, A. A. Gol'dberg, B. Ya. Levin, V. N. Logvinenko, V. A. Marchenko, V. V. Napalkov, I. V. Ostrovskii, S. Yu. Favorov
181
All-Union Seminar “Theoretical Foundations and Designing Numerical Algorithms of Problem Solving in Mathematical Physics”, deducated to the memory of K. I. Babenko
A. V. Zabrodin, V. M. Tikhomirov, A. S. Shvedov
185
The Salem Prize
S. B. Stechkin
187


© Steklov Math. Inst. of RAS, 2026